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Oak Park Unified School District
- Oak Park Neighborhood Learning Calendar
- Oak Park Independent School Calendar
- Oak View High School Calendar
- Oak Hills Elementary School Calendar
- Red Oak Elementary School Calendar
- Brookside Elementary School Calendar
- Medea Creek Middle School Calendar
- Oak Park High School Calendar
Other districts in California state
- Orinda Union Elementary School District
- Orcutt Union Elementary School District
- Oroville Union High School District
- Ontario-Montclair School District
- Oroville City Elementary School District
- Orange Unified School District
- Oxnard School District
- Oxnard Union High School District
- Oakley Union Elementary School District
- Ocean View School District
- Ojai Unified School District
- Old Adobe Union School District
- Orange Center School District
- Oceanside Unified School District
- Orchard Elementary School District
- Orick Elementary School District
- Oak Grove Elementary School District
- Oak Valley Union Elementary School District